move all subcommand to sigle file

Signed-off-by: yxxhero <aiopsclub@163.com>

cmd/fetch.go

@@ -0,0 +1,32 @@
+package cmd
+
+import (
+	"github.com/helmfile/helmfile/pkg/app"
+	"github.com/helmfile/helmfile/pkg/config"
+	"github.com/urfave/cli"
+)
+
+func addFetchSubcommand(cliApp *cli.App) {
+	cliApp.Commands = append(cliApp.Commands, cli.Command{
+		Name:  "fetch",
+		Usage: "fetch charts from state file",
+		Flags: []cli.Flag{
+			cli.IntFlag{
+				Name:  "concurrency",
+				Value: 0,
+				Usage: "maximum number of concurrent downloads of release charts",
+			},
+			cli.BoolFlag{
+				Name:  "skip-deps",
+				Usage: `skip running "helm repo update" and "helm dependency build"`,
+			},
+			cli.StringFlag{
+				Name:  "output-dir",
+				Usage: "directory to store charts (default: temporary directory which is deleted when the command terminates)",
+			},
+		},
+		Action: Action(func(a *app.App, c config.ConfigImpl) error {
+			return a.Fetch(c)
+		}),
+	})
+}